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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08e1308da902ac52cf0e535aee0618f4f33dba462e6bf85a29cd716752e0713' 
  AND token = 'M7Ml0n3T89lXCBnPavt4oqH+uK/5sqZJEB660giap1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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