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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed15a4a30e37b169cfa1a2452e67835ca5343d673f0c12aae3a346bc9e1cd5d0' 
  AND token = 'tJJX7ZsxOhG3CjY5/8gOEqiLtQ3SPyp9w9CrilXn/Uk=' 
  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"
    }
  }
}