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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b373256ecdbf2ade55701b1ab2e676227ed3b1314021cff421b1849849779f80' 
  AND token = 'vDFB7MAWhrc4Vy7Hg2gW2JXYFAQ2BP8ZeJo3DTkXuSI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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