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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '379b1c2d74e2748bdd8ef488784d3d0c9ac9d97368b65e876a2788f5bd057f50' 
  AND token = 'Wl1I1xe2L14r9iN+ya2ek57HsjS5GRnvgKSFlIb0vKY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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