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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7f843ecf090ec8e33f9c2e8f727c22e431dec784cd8c264c0f93bcb9af32261' 
  AND token = 'LHmTIojjo2Fw3PSgy4Xni8Mi8oFfuQENaifJPCaW8/c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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