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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1eaee83050becce3fdaa90de9a0cfe411d3037a837684cec115801d0e312f69' 
  AND token = '50cGTikr77PRm9xP6zskty9Tw6yXNVvRLo8Rv5pzry4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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