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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '04c56334674d61f8ba21b2d68e09a2a856176346dec6b34b537222030fc223d6' 
  AND token = '0e19j+iwHHDlG0NeSri7linTq+i3aopJhLBH3ysURKs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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