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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '874b8f0e754f23adbf0382786bae9607893562979490c8c6f67034cbeea42807' 
  AND token = '/0kddIjQ0LIhQ+dVLDitBGfx47AakbVg46LoZv7IJWY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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