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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8f05169b59d1a8ed9c03c354a0e1f8c863f9277a7f1c6a25e059a52104375be' 
  AND token = 'krgRlrgbWVcPkLhKzxEi8okyH1Pd16LunRR7UG5fblM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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