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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b7023cf18a3ba81e258e4b5cd2a3734608345f717c5702be7af1593242fa1cf' 
  AND token = '80ZKwYHKKbaj+r0eMOigretT74py0qlOpR79RgVBxsc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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