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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e96966bc8668eb9d482b1982564ff1977ab928eff9f1bb599f5ccd2b01232bb' 
  AND token = '0FLfUaTkHEi+LHI75+wCFnd2qKyymnuAo8Zh2d/Zxi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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