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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ca2fcf20df9faaf0494d2e87a1473408e6a80ec290ef1be25af4978cb00a29' 
  AND token = 'lh1ssD/j11b4Wzwf9CP4ogCCe8XPf/ryb/wGisDMJMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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