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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a9bd7a72e81b9631c6e9a65ce21e7b6f56ab9623515a25b97ff3970f82fd13e' 
  AND token = 'LqEfPvvfL6RKS5j+0aThcZvEcLLcQw2xBa2wtQKfo7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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