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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1610b86d294d63fc2ff4296e8cff8a474149850ec3edac4ff943d5040edb2c03' 
  AND token = 'cwfh6hcxWeLDEK2IQC2OA4Aoj82cddHWW62zZGGIap4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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