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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5c112e787aa0753a6166a083355dd33c861ad0c40ae0a933715a29cdb8aae4e6' 
  AND token = 'RTE3aDwYpPjAQkuU/Y4b6oa4EqHTfPm6MGEVfzW+md4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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