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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b157679d3dc0a44e89fd5c899b6db5490d02f56c09937ae4b94fa86e6aca546' 
  AND token = '4Ld59n83helAFvOYBGDyH7q2v0Q3S+rP2JLUCVi3Xic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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