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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f475392dcdd1233dca3eb83bc55d31120486a57662c59fe8b444274e131c6913' 
  AND token = 'buezk7x7+cHRvKNPZDOZqFN+xQoA0V0SAnrZnnnR1tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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