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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c6fb80591715a1595301248b3f22e042ef314d398c2d4d948b307573ead3651' 
  AND token = '/AuJKZeZjmU3KTiGy4GxwykIzfLryea1AWyM9mCtMtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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