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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32579b888d65771a12f8f1c4843a3c2cfe6444128a24a54c61f63ba44c072cbd' 
  AND token = '7zYt8K5GTZOTqc9wipTiEJn9DsyriPiELbjVPMVe7ZI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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