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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f08f95be0c3d2651151c72fe72f8c89d81a34f692c1e478eacbc18259e3dbf0e' 
  AND token = 'QxnHzVHNiyzwxfXpngB4jjQO4X7b60/EAE1SZUQI/A8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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