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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08d1943123a69268681fc6f4a016148bbf3c9352443a1f22d3c2acbfdeeccf52' 
  AND token = 'BO1d6esF5DeyU3njItpqbB/jhhZ3QhnuR3NdhuDYxRw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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