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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e5611f4ba71ef458030766e0e8b9532c4eca3fdd113bf89b84e059c43629b04' 
  AND token = 'H2bjdb4+fxkd5cIv3cd08o0tyKyZL71UP/K7ONdYKtc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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