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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6a0da1a212cdb9f3c3692b779bfbd050ddc8b76940e97bbcfbe9ade9ad1c906' 
  AND token = 'G+oPAdQj1fn33wjjTEl2FzQruTX33iD6Q9JA3hJrVeM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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