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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ed92692f3b64aa411a59174d94bea54faee3fb61cbd0159e09b9ee1a2b5cce2' 
  AND token = '/qzrmZd0Bw+cMRLkYqZb7qsfu/h7URUB9AJ0FPXeJmg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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