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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9c17903d00756d68e2faf182c586d64b5dfa6ea255e8cf3068c6fff2f6b0654' 
  AND token = 'Zc5h6xVseOI8UvTRD6r5dhxByTEJDHys/MFxGkoIKow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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