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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb797ef69c8ab6ba6f39d3e1fbe54efdc2cf4deee0556ad12a63de4cff62d1c7' 
  AND token = 'cg6ixvl8L6RhqskZ0n3aJOtEJs+8v6uAkn5gbaCbfvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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