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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0a9cd8047e77b61cf62ba47ef98dbaf039f2cb0dd7e938d8c0f1014639e73ef' 
  AND token = '2Pn/d2Lc/CUZE24BGgcRkc5mQdB8K6JG4LKmYOyqP0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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