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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c4d52730530a5dd270a7af7d0915c98a1f290cad469a85b767fddeb318a7cdf' 
  AND token = '7EZCIMi3r/ookvkdtJ+TJ7qTBhIN/Pl2G53AH4Oy73A=' 
  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"
    }
  }
}