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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85a2b64e3cb2073b3e8b9246b0090fa3aecd3c3a6eb6de2a528bbcd2e5395351' 
  AND token = '1zzvJep4JiEZD4SU4JiL4KDbqqExzoIHKuC9B7Cys4w=' 
  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"
    }
  }
}