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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2dc929863633c6e8d7bf69b0193bb4941ce0b17c4b8f0672191040c891ec2dbe' 
  AND token = 'uJydY5d5eXtSdeAZR/QO1mymJXYNBFvOgvvVlHRtcbo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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