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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed70bcc3f28ec3b2f146c93dda85cc00e7ac14d550d7c26171b18664156a2b3e' 
  AND token = 'Dcea4gv9h5tk9UBAytCu1Xee6qH6xEuucwp47KWBo4s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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