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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46d055addf5fec3240fad484c3c4f1259e50a38f41af6471c5c92954a5817c7d' 
  AND token = 'EEaugNhEeOWV8slLPwHJddEZI32+CjPjiOSAamu2etY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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