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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e5f7a145b647fc9b15c1ba65d03a9affc145e5bcbe2dcd9f0ed982f81d932e' 
  AND token = 'O5a3gYjaSVKiDRthajplAu0QKg0AtAXC4mH8hYhM1rw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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