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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcf5f90ba9e168ae3234227cf50c028397a4120322058d7beb5628b0a2a24b0c' 
  AND token = 'nibp/rs4UHS6dw+0+efMDOB5gsFghm/yqdqJhrpMD00=' 
  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"
    }
  }
}