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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a81971ce1f9118e50801c75004fd9db306893ff608a9bb6982da03e2b2addf3' 
  AND token = 'W8SffJczf35YnSOzEbp6CnkNor2kYXsHcZsGNTW4syE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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