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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '218307433fc5df967200545fdfaa7cd1a0f01164fa0732f1775dcf20b1b9110b' 
  AND token = 'Hs90WQPTrnPj9ELZn4pqbS8EBg3B04G5vxKuUna95Ms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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