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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712c92997f91d7a27a94e9e3c2890c0f8f0a01b465b60d8ef155eff3fec93054' 
  AND token = 'r9Srs/UK97aewPTUmwarFL+XBBvpa679SaYuIKebzdo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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