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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b1c091d1236e2a8ed59879e9f76354bc50bd26ca30e7891236b75ce664859cec' 
  AND token = 'AyIUDSWz4N75H/2jU9nKIm5MPR8E0+AsZsf153v1CMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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