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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0725ed7eccab8a86b99c6ab78138f542881f84bf2052339bcfca5e6b1c247120' 
  AND token = 'jwcEJjw37UinRky6BMevNKAOLPn7A1pnTydPEYn/Fvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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