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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3960f5b6b254b89c2cc1713f9ca02f0fdcfbffc0b531bbb1299990303fc3088f' 
  AND token = '1S2sTJHWcnR7RZcTbcw3ImrGbkYbNKNaGt/7Iy+/Pv4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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