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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52564e53995e8654445e59ba34ea5a56cd4c03ded948d5c19200708ef1367b9d' 
  AND token = '6EaILVufTla5BRxMpmkClXVD89EM0ZKunPMGp1Wc7ig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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