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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4ce708cc35109abbbcbc1267233f0d427e0249c39abbeff3123c47fce993aab' 
  AND token = 'LI2OB14C2Sy6H/PEdE0K3zjiz32LkgAAW/Bc40Q2R/0=' 
  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"
    }
  }
}