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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '155094c114bd541ea5fc1a1345daa6f943cbc2a875f1c0c485882a008699d232' 
  AND token = '+JU5Mra8yRxY3/JGCy1IRbdvV+iYAJS8chpn0r9tb6c=' 
  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"
    }
  }
}