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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50c101b5d409197a17d6b25c353ac0ed2f25a5ad83077b0cc2000e8a86227f7d' 
  AND token = 'No+cmQLLRiSTcmUNzofhmCG2T+s8XCGsyE773JTNoJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}