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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a235fd02d7dd7eb79c2122c10389b71fac04b4fc66dfc5262c70e02a0d1b69b8' 
  AND token = 'lSbeXYQvb9s+1hnhw72t8CKvHnxmfxuTDPiCJ3tRrgc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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