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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8587e9c024b5a0f383210764a5f03495c8813f6b453a1532939ad891ab454ec' 
  AND token = 'dDRfwCm0rJRwI+fcOK5ahWJ0B21vPa4V7MG6LF1n34o=' 
  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"
    }
  }
}