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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb31d428599d5548c320cad6a22a64278fe8b63f8bc3f66d88a47e743f36c98' 
  AND token = 'm7o+Z5Vsmlu4paVi3lluPfMAbjoXcfEdk42/bp9QF50=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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