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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '01c0e53e31b7f4f4f0a62e414f2e9d3f77f1384f2cbb7bf4d0ca68035eb6be58' 
  AND token = 'ALYoNnGRz1TXM7nnhRdBPpUkkMJDcubKW8/0HfBxcJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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