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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0e2d72dbd1265ce67c67b4240b06ac2c74733cd75a5f70abcb63439cd8423595' 
  AND token = '8wwc7Jo5f5C61UCSmVcM7F7moOLQLGYYTb1SzIur80o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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