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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '632277e25cb52c9c8e236ee0dcbd02f88ff4c6a195ee678004144e5c781e61e3' 
  AND token = 'bsHYcgBSxd/d1XPjVSHNRGHeeyqlP/SsRXwBha15DNE=' 
  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"
    }
  }
}