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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8e6ce13f5ea92e2f343389e29f6d418c7870c9051dda2af926c42bad49ee68bc' 
  AND token = '4m0GRZvqtzUIVIAypfchnOKKdAR6pB56+fGXFiGKh8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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