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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '087419845a61ea023ee8555d3e09f033675755620a60cc2bfba89d4bb3fa0436' 
  AND token = 'v++nDMtC+3fnX/Fo+hbEJ09vrh3ciDE8afweCevvW3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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