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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20a19afaada6907f386eddca1d538b2d74668983f8360a6d7ad133a293776448' 
  AND token = '61fQntFyVU+9mDLkP3ymcPZE+G1MPlBfBzu08Gejde8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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