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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '974d222113c3cb890d809c00e87f86f7b5011b77f06985ad8618624f1fb4c0e3' 
  AND token = 'qT9XKjiBsHhOOkQb5ZD/T4r6VMCnWwqsHk5N1IaP75Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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