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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '635c91143e74cb49a9a3d5270f4d9e5e33fd232cf11b9ca3350c0441cfef7ef2' 
  AND token = '/rRhG+2Q5rIledNZwLOQVtRDkns8Mx1mk2f35QuzCQM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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